New research suggests that respiratory syncytial virus (RSV) burden for infants under age 2 was 1.5-fold greater than previously believed.

Researchers found the average annual RSV infection rates among children under 2 years was 59.6 per 1,000 children for ED visits and 205.7 per 1,000 children for pediatric practice visits.

The researchers said the new estimates for children aged younger than 24 months in ED and primary care settings suggest that the RSV burden in this age group might be approximately 1.5-fold higher than what they had previously reported.

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